Tankless Water Heater Maintenance: Keeping Your System Running Efficiently

Dec 23, 2023

As a homeowner, you rely on your tankless water heater to provide hot water whenever you need it. To ensure that your system continues to run efficiently for years to come, proper maintenance is essential. In this article, we will discuss the importance of tankless water heater maintenance and provide you with useful tips and tricks to keep your system in pristine condition. At Scott Harrison Plumbing, we are dedicated to delivering high-quality home services, contractors, and plumbing solutions to our valued customers.

The Advantages of a Tankless Water Heater

Tankless water heaters have gained popularity in recent years due to their numerous advantages over traditional tank-based systems. These advanced units provide hot water on demand, eliminating the need for a storage tank and ensuring a continuous supply of hot water. This not only saves space but also reduces energy consumption and utility costs. However, to fully enjoy these benefits, regular maintenance is crucial to keep your tankless water heater in optimal condition.

Understanding Tankless Water Heater Maintenance

Maintaining a tankless water heater is relatively simple, and by following a few key steps, you can extend the lifespan of your system while maximizing its efficiency.

1. Flushing Mineral Buildup

Mineral buildup, such as limescale, can accumulate over time and affect the performance of your tankless water heater. To prevent this, it is essential to flush your system regularly. Start by turning off the power supply to the unit and closing the cold water inlet valve. Then, connect a hose to the hot water outlet and submerge the other end into a bucket. Open the purge port valves and allow the water to flow through the system, flushing out any mineral deposits. Repeat this process every six months for optimal results.

2. Checking the Pressure Relief Valve

The pressure relief valve plays a critical role in maintaining the safety and functionality of your tankless water heater. It helps regulate the pressure inside the system and prevents excessive build-up. It is recommended to check this valve annually for any signs of leakage or corrosion. If you notice any issues, contact a professional plumber to replace the valve immediately.

3. Inspecting the Venting System

Adequate venting is essential for the proper operation of your tankless water heater. Over time, debris or obstructions may accumulate in the venting system, causing improper ventilation. Regularly inspect the venting pipes, ensuring they are free from damage or blockages. If you notice any issues, contact a qualified technician to assess and repair the venting system.

4. Cleaning the Air Intake Filter

Tankless water heaters have an air intake filter that prevents dust and debris from entering the unit. This filter needs regular cleaning to maintain proper airflow and prevent potential damage to the system. Consult your manufacturer's instructions to locate the filter, remove it, and clean it thoroughly. Reinstall the filter once it is dry, ensuring it is securely in place.

Benefits of Regular Tankless Water Heater Maintenance

Regular maintenance of your tankless water heater provides a multitude of benefits, allowing you to enjoy a reliable supply of hot water while maximizing efficiency and energy savings.

1. Improved Efficiency

By regularly maintaining your tankless water heater, you remove mineral deposits that can reduce efficiency and impede performance. A clean system can operate at its full potential, providing hot water on demand with minimal energy consumption.

2. Prolonged Lifespan

Proper maintenance helps extend the lifespan of your tankless water heater. By preventing mineral buildup and addressing any issues promptly, you ensure that the system operates optimally for many years, saving you money on costly repairs or replacements.

3. Energy Savings

One of the significant advantages of a tankless water heater is its energy efficiency. Regular maintenance further enhances its efficiency, resulting in reduced energy consumption and lower utility bills. A well-maintained system not only benefits your pocket but also contributes to a greener, more sustainable future.

4. Enhanced Safety

Annual inspection of the pressure relief valve and venting system ensures the safety of your tankless water heater. These measures prevent potentially hazardous situations such as excessive pressure or gas buildup, giving you peace of mind and a safe home environment.


Tankless water heater maintenance is a vital aspect of ensuring the longevity, efficiency, and safety of your system. By following the maintenance tips outlined in this article, you can proactively protect your investment and enjoy a consistent supply of hot water for years to come. At Scott Harrison Plumbing, we specialize in Home Services, Contractors, and Plumbing, providing expert solutions and top-quality service you can rely on. For more information or to schedule a maintenance appointment, visit our website at www.scottharrisonplumbing.com.